But let's get right to ABC's Clayton Sandell on the big island of Hawaii right now where iselle is making landfall. Contemplatening. Reporter: Good morning, Amy. We are really feeling the power of iselle right now. You can see the winds are really kicking up and all around the town of Hilo, the power is completely out. Hurricane iselle has just been downgraded to a strong tropical storm but it's still packing 70-mile-per-hour winds and plenty of danger. Overnight the big island of Hawaii pummeled with some big waves. Drenching rain and powerful winds. The town of Hilo in the bull's-eye for iselle's fury. This is a unique situation. It's unprecedented. We haven't had anything like this happen. Reporter: It's crashing down on highways and power lines and electricity out to 25,000 hopes leaving people in the dark. The only light from power lines catching fire. Right now it's 6:00 P.M. And the winds are teddy at almost 20 miles an hour. It's now 9:00 and we're seeing winds over 30 miles an hour. It's now midnight and we're seeing gusts up to 50 miles an hour. Some of the 200,000 tourists in Hawaii are finding flights between the islands delayed or canceled. One from Honolulu to Los Angeles left five hours early to beat the storm. There's 22 of us. Yeah. Yeah, so it's -- we're looking out but we're hoping the rest of the family gets home okay. Reporter: Those powerful waves running 15 feet higher than Normal this morning could flood the coasts and a new fear that saturated ground will give way causing dangerous mudslides. And iselle is expected to make landfall here in the next couple of hours. Right behind it hurricane Julio, a category 3 storm that is at 115 miles an hour, Julio could strike a glancing blow on the hawaiian islands in the next 36 hours, Amy. All right, it's going to be busy there for Clayton Sandell in the hours to come. Let's get now more on the storm's path and what we can expect and ginger is tracking that. Looking at the radar at what just before landfall is looking more like a land stop. Tropical systems do not like friction and don't like it in the way of two volcano, some up to 15,000 feet so that will slow the storm down and weaken it considerably but it will stay together enough to just slip south of most of the islands. Here's the deal, though. The right side of islands as this goes through the next 24 hours, the right side of the storm is where we see the most intense as far as the worst weather goes and that's why we still have tropical storm warnings for some of those islands but, remember, right there on the big island we're most concerned about winds up to

This transcript has been automatically generated and may not be 100% accurate.

{"id":24899626,"title":"Hurricane Iselle Downgraded to Tropical Storm","duration":"2:54","description":"Following on Iselle's heels is Julio, now a category-three storm.","url":"/GMA/video/extreme-weather-hurricane-iselle-downgraded-tropical-storm-24899626","section":"GMA","mediaType":"Default"}